This little kid likes me... What should I do?

School recently started and there's this new 7th grader. I thought he was shy but he's actually really talkative and he talks to me a lot when he sees me. Recently he started calling me by nicknames. He also started purring at me and whistling at me. I noticed that i'm the only older kid he talks to. What to do?
This little kid likes me... What should I do?
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